/*
 * Copyright 2009 Andrew Pietsch 
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you 
 * may not use this file except in compliance with the License. You may 
 * obtain a copy of the License at 
 *      
 *      http://www.apache.org/licenses/LICENSE-2.0 
 *
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
 * implied. See the License for the specific language governing permissions 
 * and limitations under the License. 
 */

package com.pietschy.gwt.pectin.client.format;

/**
 * Created by IntelliJ IDEA.
* User: andrew
* Date: Aug 17, 2009
* Time: 1:18:27 PM
* To change this template use File | Settings | File Templates.
*/
public class ToStringFormat<T> implements DisplayFormat<T>
{
   private static final String EMPTY_STRING = "";
   private static final ToStringFormat<Object> DEFAULT_INSTANCE = new ToStringFormat<Object>(EMPTY_STRING);

   public static ToStringFormat<Object> defaultInstance()
   {
      return DEFAULT_INSTANCE;
   }

   private String nullValue;

   public ToStringFormat(String nullText)
   {
      this.nullValue = nullText;
   }

   public String format(T value)
   {
      return value != null ? value.toString() : nullValue;
   }
}
